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Abstract Based on the virtual internal bond model，the influence of heterogeneity index on macroscopic behavior of rock failure is studied. It is deemed by discrete virtual internal bond model(VIB) that the solid materials are composed of quality materials at micro scale，the particles are connected by a VIB，based on a special cohesive force law，the VIB model could simulate the fracture of solid materials needing no fracture guideline，and the macro constitutive equation is drawn from the interactive of the particles. Two kinds of the elements’ state are proposed—the solid element and the air element，to describe the element?s condition under the pressure. By simulating the rock fracture process when the heterogeneity index m = 1.1，1.5，2.0，3.0，5.0，it is found that the heterogeneity has immense influence on the stress-strain curve and the fracture modes：with the higher heterogeneity index，the stronger linearity of the pre- stress-strain curve，and the higher peak stress，the deeper post stress-strain curve，and the fracture mode presents markedly brittle behavior.
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Received: 12 March 2010
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2011, Vol. 30 
